This is a widespread variable species native to Eurasia. Plants in North America are generally treated as ssp. scoparia (FNA 4). The common cultivar "summer cypress" can be treated as forma trichophylla (A. Voss) Stapft ex Schinz & Thellung (apparently = var. culta Farw. but not = var. trichophylla (Stapf) Bailey). This cultivar is less hairy, have relatively long narrow leaves, and turns bright red in the fall (see also Cr). Clearly escaped plants of this cultivar are known (M) from CAMP (KNK), MASO (sight record) and PIKE (EKY), but they are not included in the map.